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Environmental and developmental regulation of carotenogenesis in the dimorphic fungus Mucor rouxii

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Abstract

Aerobic mycelium of wild-type Mucor rouxii accumulated about ten times higher amounts of the carotenoid pigment β-carotene when grown continuously in the presence of light than the corresponding cultures grown in the dark. Carotenoid accumulation was dependent on light intensity, with the threshold located at about 10-2 W.m-2. Photocarotenogenesis in complex medium was more efficient with glucose as a carbon source. Carotenoid synthesis by M. rouxii mycelium was unaffected by both retinol acetate and retinal, which are stimulators of carotenogenesis in other zygomycetes. Carotenogenesis was significant in aerobic mycelium but was almost undetectable in anaerobic mycelium as well as in aerobic or anaerobic yeast cells. This suggested an involvement of oxygen in carotenoid synthesis by M. rouxii and the existence of developmental regulation of the expression or operation of the pathway.

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  1. Instituto de Investigación en Biología Experimental, Facultad de Química, Universidad de Guanajuato, Apartado Postal 187, 36000, Guanajuato, Gto., México

    Gilberto Mosqueda-Cano & J. Félix Gutiérrez-Corona

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  1. Gilberto Mosqueda-Cano
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  2. J. Félix Gutiérrez-Corona
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Mosqueda-Cano, G., Gutiérrez-Corona, J.F. Environmental and developmental regulation of carotenogenesis in the dimorphic fungus Mucor rouxii . Current Microbiology 31, 141–145 (1995). https://doi.org/10.1007/BF00293544

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